An expert says planning laws often need to be tweaked after they've passed. 

The Housing Minister will announce details of amendments to the fast-track system later this morning after multiple council complaints about fast-tracked housing developments.  

Mt Hobson Group Urban Planning Specialist Hamish Firth says the fast-track system was well intentioned and has helped build things like new quarries. 

But he told Mike Hosking it's a system which needs to shift.  

Firth suggests they might not have expected so many housing developments to be included. 

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